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https://www.readbyqxmd.com/read/28162894/the-neolithic-transition-in-the-baltic-was-not-driven-by-admixture-with-early-european-farmers
#1
Eppie R Jones, Gunita Zarina, Vyacheslav Moiseyev, Emma Lightfoot, Philip R Nigst, Andrea Manica, Ron Pinhasi, Daniel G Bradley
The Neolithic transition was a dynamic time in European prehistory of cultural, social, and technological change. Although this period has been well explored in central Europe using ancient nuclear DNA [1, 2], its genetic impact on northern and eastern parts of this continent has not been as extensively studied. To broaden our understanding of the Neolithic transition across Europe, we analyzed eight ancient genomes: six samples (four to ∼1- to 4-fold coverage) from a 3,500 year temporal transect (∼8,300-4,800 calibrated years before present) through the Baltic region dating from the Mesolithic to the Late Neolithic and two samples spanning the Mesolithic-Neolithic boundary from the Dnieper Rapids region of Ukraine...
January 27, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28148921/subdivisions-of-haplogroups-u-and-c-encompass-mitochondrial-dna-lineages-of-eneolithic-early-bronze-age-kurgan-populations-of-western-north-pontic-steppe
#2
Alexey G Nikitin, Svetlana Ivanova, Dmytro Kiosak, Jessica Badgerow, Jeff Pashnick
Prehistoric Europe experienced a marked cultural and economic shift around 4000 years ago, when the established Neolithic agriculture-based economy was replaced by herding-pastoralist industry. In recent years new data about the genetic structure of human communities living during this transition period began to emerge. At the same time, the genetic identities of the Eneolithic and Early Bronze Age (EBA) inhabitants from a prehistoric cultural crossroad in western North Pontic steppe region remain understudied...
February 2, 2017: Journal of Human Genetics
https://www.readbyqxmd.com/read/28124749/ixodid-ticks-parasitizing-wild-carnivores-in-romania
#3
Gianluca D'Amico, Mirabela Oana Dumitrache, Ioana Adriana Matei, Angela Monica Ionică, Călin Mircea Gherman, Attila David Sándor, David Modrý, Andrei Daniel Mihalca
In Romania, data regarding hard-tick diversity and tick-host associations in wild carnivores are scarce. We aimed to identify tick species in wild carnivores and to establish reliable data on tick-host associations. The study was conducted in various Romanian localities from all five ecoregions found in the country. Fourteen species of wild carnivores were examined. Immature and adult ticks were collected and identified using the morphological keys. The frequency and mean intensity of tick infestation, overall and differentiated by species, developmental stage and host were calculated...
January 26, 2017: Experimental & Applied Acarology
https://www.readbyqxmd.com/read/27994892/natural-tooth-pontic-an-instant-esthetic-option-for-periodontally-compromised-teeth-a-case-series
#4
Rishi Raj, Kriti Mehrotra, Ipshita Narayan, Triveni Mavinakote Gowda, D S Mehta
Sudden tooth loss in the esthetic zone of the maxillary or mandibular anterior region can be due to trauma, periodontal disease, or endodontic failure. The treatment options for replacing the missing tooth can vary between removable prosthesis, tooth-supported prosthesis, and implant-supported prosthesis. Irrespective of the final treatment, the first line of management would be to provisionally restore the patient's esthetic appearance at the earliest, while functionally stabilizing the compromised arch. Using the patient's own natural tooth as a pontic offers the benefits of being the right size, shape, and color and provides exact repositioning in its original intraoral three-dimensional position...
2016: Case Reports in Dentistry
https://www.readbyqxmd.com/read/27939656/clinical-audit-of-posterior-three-unit-fixed-movable-resin-bonded-fixed-partial-dentures-a-retrospective-preliminary-clinical-investigation
#5
Michael G Botelho, John E Dyson, Thomas H F Mui, Walter Y H Lam
BACKGROUND: Two-unit cantilevered resin-bonded fixed partial dentures (RBFPDs) have higher retention rates over longer span fixed-fixed RBFPDs. It has been hypothesized that interabutment stresses associated with fixed-fixed designs cause prosthesis debonds therefore for the replacement of molar-sized and longer spans, non-rigid connectors have been used to allow independent movement between two abutment teeth. OBJECTIVES: This preliminary study evaluates the clinical longevity and subjects' satisfaction of three-unit fixed-movable (FM3) RBFPDs provided at a dental teaching hospital...
December 6, 2016: Journal of Dentistry
https://www.readbyqxmd.com/read/27861651/the-influence-of-bone-quality-on-the-biomechanical-behavior-of-a-tooth-implant-fixed-partial-denture-a-three-dimensional-finite-element-analysis
#6
Alexander Tsouknidas, Dimitrios Giannopoulos, Savvas Savvakis, Nikolaos Michailidis, Evdokia Lympoudi, Dimitrios Fytanidis, Argirios Pissiotis, Konstantinos Michalakis
PURPOSE: The purpose of this study was to evaluate whether or not bone quality has an effect on the biomechanical behavior of a tooth connected to an implant, when a rigid and a nonrigid attachment are used. MATERIALS AND METHODS: Models of fixed partial dentures supported by a tooth and an implant were developed. These models were then imported into finite element analysis software to study the impact of forces on different types of attachments (rigid vs nonrigid) and bones (types 1 to 4)...
November 2016: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/27859471/volumetric-changes-at-pontic-sites-with-or-without-soft-tissue-grafting-a-controlled-clinical-study-with-a-10-year-follow-up
#7
Stefan P Bienz, Irena Sailer, Ignacio Sanz-Martín, Ronald E Jung, Christoph H F Hämmerle, Daniel S Thoma
OBJECTIVE: To evaluate volumetric changes of soft tissues at pontic sites in patients treated with or without soft tissue grafting over an observation period of 10 years. MATERIALS AND METHODS: A total of 17 patients receiving a tooth-borne fixed dental prosthesis (FDP) were enrolled in this study. Nine patients received a subepithelial connective tissue graft (SCTG) at the pontic site (test). Eight patients continued without soft tissue grafting (control). Baseline impressions were taken after delivery of the final FDP and at 10 years...
November 17, 2016: Journal of Clinical Periodontology
https://www.readbyqxmd.com/read/27824975/analysis-of-endodontic-complications-following-fixed-prosthodontic-rehabilitation
#8
Zeynep Uzgur, Recep Uzgur, Hakan Çolak, Ertuğrul Ercan, Mehmet Dallı
PURPOSE: The aim of this study was to determine endodontic treatment needs and types of endodontic disease following fixed prosthodontic treatment 24 hours after tooth preparation, 1 week after tooth preparation, 1 month after placement, and 6 months after placement. MATERIALS AND METHODS: Study groups consisted of patients who attended a university dental hospital department of prosthodontics for fixed prosthodontic treatment from January 2011 to December 2013...
November 2016: International Journal of Prosthodontics
https://www.readbyqxmd.com/read/27803981/genetic-structure-of-the-early-hungarian-conquerors-inferred-from-mtdna-haplotypes-and-y-chromosome-haplogroups-in-a-small-cemetery
#9
Endre Neparáczki, Zoltán Juhász, Horolma Pamjav, Tibor Fehér, Bernadett Csányi, Albert Zink, Frank Maixner, György Pálfi, Erika Molnár, Ildikó Pap, Ágnes Kustár, László Révész, István Raskó, Tibor Török
We applied ancient DNA methods to shed light on the origin of ancient Hungarians and their relation to modern populations. Hungarians moved into the Carpathian Basin from the Eurasian Pontic steppes in the year 895 AD as a confederation of seven tribes, but their further origin remains obscure. Here, we present 17 mtDNA haplotypes and four Y-chromosome haplogroups, which portray the genetic composition of an entire small cemetery of the first generation Hungarians. Using novel algorithms to compare these mitochondrial DNA haplogroups with other ancient and modern Eurasian data, we revealed that a significant portion of the Hungarians probably originated from a long ago consolidated gene pool in Central Asia-South Siberia, which still persists in modern Hungarians...
February 2017: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/27783438/precise-placement-of-single-retainer-resin-bonded-fixed-dental-prostheses-with-an-innovative-splint-design
#10
Michael Stimmelmayr, Martin Stangl, Judith Kremzow-Stangl, Gerald Krennmair, Florian Beuer, Daniel Edelhoff, Jan-Frederik Güth
Single-retainer resin-bonded fixed dental prostheses (RBFDPs) are difficult to position due to the pressure of soft tissue at the pontic area and the single-retainer design. This clinical report describes an innovative technique for the insertion of single-retainer RBFDPs. An incisal inserting splint is used to position the RBFDPs reliably. With the help of grooves in the buccal and incisal area of the splint, the precise positioning of the splint on the adjacent teeth and the RBFDP can be controlled. Also, a hole in the retainer wing region of the splint gives access for pressure application on the wing during the bonding process...
October 26, 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
https://www.readbyqxmd.com/read/27747645/a-piezo-surgery-with-corticotomies-and-implant-placement-as-part-of-a-multidisciplinary-approach-to-treat-malocclusion-disorder-in-an-adult-patient-clinical-report
#11
Federico Gelpi, Daniele De Santis, Simone Marconcini, Francesco Briguglio, Marco Finotti
This clinical report illustrates a multidisciplinary approach for the rehabilitation of a young adult patient affected by a bilateral edentulous space and an anterior deep bite. The patient required orthodontics and surgical corticotomy and implantology (both performed with a piezo device). A multidisciplinary planning approach, including orthodontics, oral and periodontic surgery, and restorative dentistry, has an important role in the final outcome of treatment. In fact a dental class I occlusion has been established only on the right side...
December 2015: International Journal of Implant Dentistry
https://www.readbyqxmd.com/read/27746602/knowledge-attitude-and-practice-of-dental-professionals-regarding-the-effect-and-management-of-food-impaction-associated-with-fixed-partial-denture-prostheses-a-survey
#12
Aradhana Nagarsekar, Ridhima Gaunkar, Meena Aras
OBJECTIVE: This survey was undertaken to assess dentist's opinion regarding the occurrence and pattern of food impaction in relation to fixed partial denture (FPD) prostheses, its commonly observed consequences, factors contributing to it, and its management. METHODS: A descriptive survey was conducted on a sample size of 150 dental practitioners. The pro forma consisted of informed consent, demographic information, and questionnaire. The results were tallied and quantitative analysis was performed to obtain the descriptive statistics for the data using SPSS version 20...
October 2016: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/27740655/fracture-strength-failure-types-and-weibull-characteristics-of-three-unit-zirconia-fixed-dental-prostheses-after-cyclic-loading-effects-of-veneering-and-air-abrasion-protocols
#13
Fernanda Campos, Rodrigo Oa Souza, Marco A Bottino, Mutlu Özcan
The required connector dimension for zirconia fixed dental prostheses (FDPs) may be a clinical limitation due to limited space in the occlusogingival direction. Using no veneering in the gingival regions of the pontics and connectors may solve this problem. This study evaluated the mechanical durability of zirconia FDPs with and without veneering in the gingival area of the connectors and pontics and subsequent air abrasion of this region with different protocols. Models were made of resin abutments (diameter = 6 or 8 mm, height = 6 mm, 6 degrees convergence) and embedded in polyurethane resin (distance = 11 mm)...
November 2016: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/27680671/survival-and-failure-modes-platform-switching-for-internal-and-external-hexagon-cemented-fixed-dental-prostheses
#14
Rodolfo B Anchieta, Lucas S Machado, Ronaldo Hirata, Paulo G Coelho, Estevam A Bonfante
This study evaluated the probability of survival (reliability) of platform-switched fixed dental prostheses (FDPs) cemented on different implant-abutment connection designs. Eighty-four-three-unit FDPs (molar pontic) were cemented on abutments connected to two implants of external or internal hexagon connection. Four groups (n = 21 each) were established: external hexagon connection and regular platform (ERC); external hexagon connection and switched platform (ESC); internal hexagon and regular platform (IRC); and internal hexagon and switched platform (ISC)...
October 2016: European Journal of Oral Sciences
https://www.readbyqxmd.com/read/27632259/an-in-vivo-study-on-load-distribution-in-different-implant-configurations-for-supporting-fixed-partial-dentures
#15
Hiromori Kobari, Nobuhiro Yoda, Junning Chen, Tetsuo Kawata, Keiichi Sasaki
PURPOSE: The aims of this study were to develop a device for in vivo measurement of three-dimensional (3D) loads on implants and to investigate the effects of implant configuration on the load distribution under a three-unit fixed partial denture (FPD). MATERIALS AND METHODS: A 67-year-old female patient with three implants (in the mandibular left second premolar, first molar, and second molar regions) was recruited. Four implant configurations for a three-unit FPD depending on the number and position of the implants were considered in this study...
September 2016: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/27628910/simulation-of-multi-stage-nonlinear-bone-remodeling-induced-by-fixed-partial-dentures-of-different-configurations-a-comparative-clinical-and-numerical-study
#16
Zhipeng Liao, Nobuhiro Yoda, Junning Chen, Keke Zheng, Keiichi Sasaki, Michael V Swain, Qing Li
This paper aimed to develop a clinically validated bone remodeling algorithm by integrating bone's dynamic properties in a multi-stage fashion based on a four-year clinical follow-up of implant treatment. The configurational effects of fixed partial dentures (FPDs) were explored using a multi-stage remodeling rule. Three-dimensional real-time occlusal loads during maximum voluntary clenching were measured with a piezoelectric force transducer and were incorporated into a computerized tomography-based finite element mandibular model...
September 15, 2016: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/27621552/soft-tissue-development-around-pontic-site-a-case-series
#17
Sarita Joshi Narayan, Pranav Kumar Singh, Achut R Devarhubli, R Keerthi
An ideal emergence profile is vital for maintaining gingival health and developing esthetics. The ovate pontic which mimics a natural tooth gives the most appropriate emergence profile. For a successful ovate pontic restoration, an alveolar ridge of sufficient height and width is necessary to enhance the deficient ridge and to achieve an esthetic emergence profile. Interpositional graft was carried out along with ovate pontic to achieve an ideal esthetic restoration. After three months of the postoperative period, there was an increased horizontal dimension in the deficient ridge and an esthetic emergence profile...
July 2016: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/27621545/the-effectiveness-of-adding-a-supporting-implant-in-stress-distribution-of-long-span-fixed-partial-denture-three-dimensional-finite-element-analysis
#18
Rami Shurbaji Mozayek, Mohammad Yamen Shurbaji Mozayek, Mirza Allaf, Mohammad Bassam Abouharb
CONTEXT AND AIMS: Long span is seen in many clinical situations; treatment planning options of these cases are difficult and may require: Fixed partial denture (FPD), removable partial denture, or implant supported prostheses. Each option has its own disadvantages: Mechanical, patient relief, and cost, respectively. This article will evaluate the stress distribution of another treatment option, which is adding a single supporting implant to the FPD using three-dimensional (3D) finite element analysis...
July 2016: Journal of Indian Prosthodontic Society
https://www.readbyqxmd.com/read/27560672/partial-extraction-therapies-pet-part-1-maintaining-alveolar-ridge-contour-at-pontic-and-immediate-implant-sites
#19
Howard Gluckman, Maurice Salama, Jonathan Du Toit
Buccopalatal collapse of the postextraction ridge is a significant challenge in restorative and implant dentistry. A variety of ridge preservation techniques using tissue and augmentative materials have been proposed in the literature. A slightly different approach is to use the tooth itself. Root submergence has been reported in the literature for more than 4 decades, and it has been demonstrated that the submerged tooth root retains the periodontal tissues and preserves the bone in pontic sites or below dentures to retain the ridge...
September 2016: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/27547517/pleistocene-phylogeography-and-cryptic-diversity-of-a-tiger-beetle-calomera-littoralis-in-north-eastern-mediterranean-and-pontic-regions-inferred-from-mitochondrial-coi-gene-sequences
#20
Radomir Jaskuła, Tomasz Rewicz, Mateusz Płóciennik, Michał Grabowski
Background. Calomera littoralis is a Palearctic species, widely distributed in Europe; inhabiting predominantly its Atlantic, Mediterranean and Black Sea coastlines. Methods. Its phylogeography on the Balkan Peninsula and on the north-western Black Sea coast was inferred using a 697 bp long portion of the mitochondrial COI gene, amplified from 169 individuals collected on 43 localities. Results. The results revealed two genetically divergent groups/lineages, the southern one inhabiting both the Balkan Peninsula and the Pontic Region and the northern one found exclusively in the Pontic Region...
2016: PeerJ
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